[regexp] Limit ATOM regexps to patterns length <= 2
This is a modified reland of 062bb7d4 There's an inherent trade-off when deciding between ATOM and IRREGEXP regexps: IRREGEXP is faster at runtime for all but trivial short patterns, while ATOM regexps have a lower memory overhead. This CL is intended to help investigate impact on benchmarks and real-world code - if something tanks, it's easy to revert, otherwise it can be a first step towards a possible removal of ATOM regexps. Bug: v8:6633 Change-Id: I8d946a7cbb398d4987b47ecba24c9faa88788d0d Reviewed-on: https://chromium-review.googlesource.com/599910Reviewed-by: Yang Guo <yangguo@chromium.org> Commit-Queue: Jakob Gruber <jgruber@chromium.org> Cr-Commit-Position: refs/heads/master@{#47164}
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